First, let me make one thing clear: According to Media Matters, and you all know they pay attention, Matthews was right about the first video posted by Breitbart. It did include Sherrod alluding to the epiphany she describes in detail later, about the fact that many issues aren't about black and white, they're about the haves and have nots. There are also versions of the video that don't include that quote. I had seen both versions; Dean had only seen those that didn't have the short allusion to her epiphany about the importance of "have nots" cooperating around economic issues.
http://www.salon.com/news/shirley_sherrod/?story=/opinion/walsh/politics/2010/07/29/the_wrong_lessons_of_the_sherrod_story